use exception mechanism. (camel_folder_set_name): idem.

use exception mechanism. (camel_folder_set_name): idem.

1999-12-17  bertrand  <Bertrand.Guiheneuf@aful.org>

	* camel/camel-folder.c (_set_name):
	use exception mechanism.
	(camel_folder_set_name): idem.
	(camel_folder_set_full_name): idem.
	(_get_name): idem.
	(camel_folder_get_name): idem.
	(_get_full_name): idem.
	(camel_folder_get_full_name): idem.
	(_can_hold_folders): idem.
	(_can_hold_messages): idem.
	(_exists): idem.
	(camel_folder_exists): idem.
	(_is_open): idem.
	(_get_subfolder): idem.
	(camel_folder_get_subfolder): idem.

	* camel/camel-exception.c (camel_exception_clear):
	New function. Clear an exception.
	(camel_exception_get_id):
	New function.
	(camel_exception_get_description):
	New function.

	* camel/camel-folder.c (_set_name):
	Use the exception system. When the folder
	has no parent, don't set its full name
	field.